2004 Mazda 3 AT light on the Dash Board

While doing normal driving the car made a little jump, the check engine light and the "AT" light came on - yet continued to drive ok. And not being able to locate my owers manual... And of course on a weekend - I can't call the dealership...
1. What does the AT light mean... We thought Automatic Transmission.
2. Added some All Purpose Transmission Fluid to get through the weekend
3. Both lights have gone off and while I am limited the amount of driving... Until I can call the dealership can you shed a little light on my sitution?
Regards - David